*{
	padding: 0;
	margin: 0;
	box-sizing: border-box;
}
nav{
	text-align: center;
	width: 100%;
	
	background: #e9ecef;
	margin-bottom: 30px;
}
nav .nav1{
	padding-top: 100px;
	padding-bottom: 100px;
}
nav h1{
	font-size: 50px;
	font-weight: 100;
}
nav h3{
	color: #474a76;
	margin-top: 15px;
}
.consin{
	width: 1200px;
	margin: auto;
}
.main-1 {
	margin-bottom: 20px;
	overflow: hidden;
}
.main-1 #btn_if{
	float: left;
}
.main-1 #btn_that{
	float: right;
}
.main .main-1 button{
	
	width: 170px;
	height: 40px;
}
.main .main-1 .b1{
	background: #5aaaff;
	color: white;
}
.main .main-1 .a1{
	background: #6c757d;
	width: 200px;
	margin: 0 150px;
	color: white;
}
.main-2{
	margin-bottom: 20px;
}
.main .main-2 input{
	
	margin: 0 15px;
	width: 47%;
    height: 218px;
	padding-bottom: 131px;
	padding-left: 20px;
}
.main .i1{
	background: #e9ecef;
}
.main-3 button{
	background: #5aaaff;
	color: white;
	width: 250px;
	height: 40px;
}